Finding the Fourth Proportional to 1,216.74, 1,818.12 and 997.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.74 : 1,818.12 = 997.50 : x
2. Step 2: Convert to fraction form
   1,216.74/1,818.12 = 997.50/x
3. Step 3: Cross multiply
   1,216.74x = 1,818.12 × 997.50
4. Step 4: Simplify right side
   1,216.74x = 1,813,574.70
5. Step 5: Solve for x
   x = 1,813,574.70/1,216.74
6. Step 6: Final answer
   x = 1,490.52